Advice on changing from stock 14 inch rims and spacing

That's the size of one of the ones I was looking at. Except backspacing on the front says 4 1/8 backspacing on front and 4 1/4 back.

Also offset +3 and -6😳
Same size tires though!

Sounds close enough. Don't worry about "offset". Those offset numbers look wrong to me, and 99% of us here would prefer to talk about backspacing anyways. It is best to adhere to the KISS principle (Keep It Simple-Stupid).