Did the wax change? No. Did the application process change? No. It's just a different styled brush that is a bit more ergonomically shaped. But you don't have to this special brush or the big flat one above to finish your pieces. No, you don't.....
If you are going to be doing a lot of painting and waxing, the brushes help for sure. But if you are going to be doing one piece or a couple....I wouldn't recommend spending all of that money on a brush for just a few times. You can, but they cost a lot of money if you aren't going to get your moneys worth out of it.
One of my favorite go to wax applicators is a simple lint free white cotton cloth. You can get a hole bag of them from the hardware store for under $5.00. But make sure they are lint free! :)
I own the brushes.....and yes they work great. I do a lot of painting and waxing. But I often find myself reaching for a cloth instead. It's actually easier to control when you use a rag and I throw the rag away so I don't have to clean my brush when I'm done. :)
So don't let anyone talk you into buying a wax brush for one piece. The wax works the same and the outcome is the same whether you brush it on or rag it on. Use a small amount on your rag, wipe it into the wood evenly and then take a clean rag and wipe it off. Work in small sections. Then come back and buff.
It really is that simple.
Have a great week.