Color Merge and ETC Fixtures

I don't know where to ask this, because nobody knows the clear answer. So I post it here.
Can anybody tell me with which fixtures de Color Merge works. The specs tell that it can be mounted with the Standard ETC Source Four fixtures. Does that include the Zoom versions? I need to know if the Color Merge can be used with the ETC Source 4 Zoom 25-50°.
I hope someone can help me out.

Greetings, Martijn Satter
Relight Productions, The Netherlands
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