FSA Tempo crankset - Won't fit Shimano PD-R7000 Pedals

[wafter]

Unfortunately, I'm very much new to cycling and also don't have any real tools

A vernier caliper would be great but tbh even just wrapping a tape measure around the threads or butting their ends against each other should provide a sufficient comparison to confirm that they're different sizes.

 

[vickster]

Unfortunately, I'm very much new to cycling and also don't have any real tools

Ask your lbs for help?

 

[Ajax Bay]

What are the old pedals (make/model)?

 

[Gunk]

They should fit, I’ve had FSA Omega and Gossamer cranksets before and they’re just standard threads.