THESE ARE EXISTING ENTRIES

go into the popgroups you're trying to merge my mod with (i.e if you try to merge my mod with ambient gang, open the ambient gang
Popgroups file)

look at the name each entry has and find it in the popgroups file then paste my entries over the existing ones,
or look at the ped entry within the main entry and just copy that over 

ped entry example:

        <Item>
          <Name>a_m_m_grisurvivalist_01</Name>
          <Variations type="NULL"/>
        </Item>

Whole Entries:

    <Item>
      <Name>0x3AB933FE</Name>
      <models>
        <Item>
          <Name>a_m_m_griroughtravellers_01</Name>
          <Variations type="NULL"/>
        </Item>
        <Item>
          <Name>a_m_m_grisurvivalist_01</Name>
          <Variations type="NULL"/>
        </Item>
      </models>
      <flags>POPGROUP_AMBIENT POPGROUP_SCENARIO</flags>
      <AIMemoryGroup/>
    </Item>

    <Item>
      <Name>bna_camp_males</Name>
      <models>
        <Item>
          <Name>a_m_m_bynroughtravellers_01</Name>
          <Variations type="NULL"/>
        </Item>
        <Item>
          <Name>a_m_m_bynsurvivalist_01</Name>
          <Variations type="NULL"/>
        </Item>
      </models>
      <flags>POPGROUP_AMBIENT POPGROUP_SCENARIO</flags>
      <AIMemoryGroup/>
    </Item>


    <Item>
      <Name>hrt_civilians</Name>
      <models>
        <Item>
          <Name>a_m_m_htlroughtravellers_01</Name>
          <Variations type="NULL"/>
        </Item>
        <Item>
          <Name>a_m_m_htlsurvivalist_02</Name>
          <Variations type="NULL"/>
        </Item>
      </models>
      <flags>POPGROUP_AMBIENT POPGROUP_SCENARIO</flags>
      <AIMemoryGroup/>
    </Item>

    <Item>
      <Name>hrt_horse_riders</Name>
      <models>
        <Item>
          <Name>a_m_m_htlroughtravellers_01</Name>
          <Variations type="NULL"/>
        </Item>
        <Item>
          <Name>a_m_m_htlsurvivalist_02</Name>
          <Variations type="NULL"/>
        </Item>
      </models>
      <flags>POPGROUP_AMBIENT POPGROUP_SCENARIO</flags>
      <AIMemoryGroup/>
    </Item>


    <Item>
      <Name>0x49E12163</Name>
      <models>
        <Item>
          <Name>a_m_m_htlroughtravellers_01</Name>
          <Variations type="NULL"/>
        </Item>
        <Item>
          <Name>a_m_m_htlsurvivalist_02</Name>
          <Variations type="NULL"/>
        </Item>
      </models>
      <flags>POPGROUP_AMBIENT POPGROUP_SCENARIO</flags>
      <AIMemoryGroup/>
    </Item>


    <Item>
      <Name>0xF8C7B1CB</Name>
      <models>
        <Item>
          <Name>a_m_m_griroughtravellers_01</Name>
          <Variations type="NULL"/>
        </Item>
        <Item>
          <Name>a_m_m_grisurvivalist_01</Name>
          <Variations type="NULL"/>
        </Item>
      </models>
      <flags>POPGROUP_AMBIENT POPGROUP_SCENARIO</flags>
      <AIMemoryGroup/>
    </Item>


    <Item>
      <Name>roa_horse_riders</Name>
      <models>
        <Item>
          <Name>a_m_m_rkrroughtravellers_01</Name>
          <Variations type="NULL"/>
        </Item>
        <Item>
          <Name>a_m_m_rkrroughtravellers_01</Name>
          <Variations type="NULL"/>
        </Item>
      </models>
      <flags>POPGROUP_AMBIENT POPGROUP_SCENARIO</flags>
      <AIMemoryGroup/>
    </Item>


    <Item>
      <Name>bay_horse_riders</Name>
      <models>
        <Item>
          <Name>a_m_m_bynroughtravellers_01</Name>
          <Variations type="NULL"/>
        </Item>
        <Item>
          <Name>a_m_m_bynsurvivalist_01</Name>
          <Variations type="NULL"/>
        </Item>
      </models>
      <flags>POPGROUP_AMBIENT POPGROUP_SCENARIO</flags>
      <AIMemoryGroup/>
    </Item>


    <Item>
      <Name>blu_horse_riders</Name>
      <models>
        <Item>
          <Name>a_m_m_bynroughtravellers_01</Name>
          <Variations type="NULL"/>
        </Item>
        <Item>
          <Name>a_m_m_bynsurvivalist_01</Name>
          <Variations type="NULL"/>
        </Item>
      </models>
      <flags>POPGROUP_AMBIENT POPGROUP_SCENARIO</flags>
      <AIMemoryGroup/>
    </Item>