I received a couple of The Black Series 6" 51: Finn (First Order Disguise) figures today from Amazon and noticed that the head looks a bit different from the ones I bought on Force Friday II at Toys R us.
The figure I bought form Toys R Us has a earlier date stamp and it looks like Hasbro painted the flesh tone on this head, while the later date stamp looks to have the flesh tone color mixed into the plastic.
• 1st version - Painted flesh tone on Head.
• 2nd version - Flesh tone color mixed in head plastic.
If you recall this variant happen on The Black Series 6" 01: Finn (Jakku) as well.