Change type again

Hi,
Can someone tell me if i change type from one fixture to another does the console use the fixture lib that i started the original show with or does it load all fixture libs including uncommon fixtures.
I could check this but thought someone might already know or checked?

I'm doing a few shows that i know are going to have older fixture types and wondering are all fixtures available to change type or if not do i have to merge that fixture into the show first or is there another method/option.

thanks in advance.
C
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