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Not on the 2014/2015 models, however you can do it on the 2017/2019 models - but these require taking the logic board out.
 
OP:

Do you have the ability and confidence to almost completely disassemble the iMac?

If so, you can change out the RAM.

If not, the answer to your simple question is... "no".
 
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I believe doing this yourself voids the warranty... I would check into that... I got the 27 inch partially for that reason... hatch on back for easy ram install.
 
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