Are all IRFB4110 MosFET's the same?

MOSFETs of the same type usually have quite a lot of variation to begin with. Chinese knockoffs will work too, but are likely to offer slightly worse performance and durability.

I'd replace all of the 4110 entirely, there are better alternatives nowadays. Such as the CSD19536KCS, which offers a 40% reduction in RDSon.
 
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