Short answer: no, you can't swap ear tips between AirPods Pro 3 and Pro 2. Apple changed the design completely, so they're not compatible.
What Changed
Apple didn't just tweak the ear tips. They redesigned them from scratch:
New Shape: The attachment mechanism is different. Pro 2 tips simply won't fit on Pro 3 buds (and vice versa).
Heart Rate Sensor Needs: Since the Pro 3 has a heart rate monitor, the tips had to be designed to ensure proper skin contact inside your ear.
Better Material: The new tips use foam-infused silicone instead of just silicone. They feel a bit different and many people find them more comfortable and better at blocking noise.
More Size Options: You now get five sizes (XXS, XS, S, M, L) instead of four. The new XXS size is great for people with smaller ear canals who struggled with XS tips before.
Where to Get Replacements
You've got options:
From Apple: About $29 for a pack with all five sizes, or you can buy two-pair packs of a specific size for less.
Third-Party: Companies make compatible tips, but make sure they specifically say "AirPods Pro 3" on the packaging. Anything labeled for Pro 2 won't work.
Quick Tip: Check Your Size
Not sure what size you're currently using? Gently roll back the edge of the ear tip and look inside near the base. You'll see XXS, XS, S, M, or L etched there.
One More Thing
With the heart rate sensor on Pro 3, you might find that the best size for sound quality isn't the best size for heart rate tracking. The sensor needs good skin contact, so if you're getting spotty heart rate readings, try going up a size even if the smaller one sounds better.
Compare AirPods Pro 3 prices across retailers.