Ok so I'm getting a new frame soon and I'm trying to determine the appropriate stem length. I would get fitted at an LBS but they wanna charge an extra $15-20 for a stem (in this case a nitto pearl) that I could get online cheaper. I'm already gonna pay them to swap parts for me so don't give me sh*t about not supporting my LBS.

Anyway, the frame I plan on getting has a slightly diff/less aggresive geo then my current bike. I'm just trying figure out whether or not I would need to get a longer, shorter, or a stem with the same length.

All in mm

This is the geo of my current bike:
Seat tube: 530
Top tube length: 535
chainstay: 383
Head tube angle: 74
Seat tube angle: 75.5

Geo of the frame I plan on getting:
Seat tube: 517
height from bb to top tube: 490
Top tube length: 535
chainstay: 385
head tube angle: 72
Seat tube angle: 75

I currently run a 100 mm stem (stem is level) and I feel very comfortable with it. Obviously this new frame is not as aggresive and I'm not trying to replicate that. I'm just trying to figure out how much of a shorter or longer stem I would need considering the head tube angle. Or does that even matter considering the top tube length is the same. I'm not sure if this question makes sense so please feel free to re-phrase what i'm trying to ask here.