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Tried it with the cellars mod and merchants mod and couldn't get it to work, but just in case you want to try yourself:

Open the TFC+ .jar file with 7-zip (or another archiver like winrar), there should be a "mcmod.info" file in there. In 7-zip, right click it and click "edit". In mcmod.info, where it says

"modid": "terrafirmacraftplus"

remove the "plus" so the modid is "terrafirmacraft". Save and close, say yes when 7-zip asks if you want to update it in the archive.