Swapping wheels and cassettes with Shimano GRX 600/800 I am in the market for a gravel bike. I plan on getting a second set of wheels for road rides. This bike will most likely have Shimano GRX 600 or 800 2x and an 11-34 cassette. Assuming the rear derailleur is set up properly for that cassette, I'm curious if there any issues having an 11-28 cassette on the road wheels to get closer ratios:

Would any derailleur adjustment be needed when swapping?
Would a chain sized for the larger cassette work with the smaller one?
What is the maximum difference that would likely operate satisfactorily?

Most of the trails out here are quite rough and steep, so there isn't an ideal tire or gearing for both road and dirt rides.
My experience with swapping wheels is disappointing.
I had to adjust the derailleur (limit screws, cable tension) and rim brakes (due to slight difference in rim width and dish) every time I swapped wheels. Maybe if you have exactly the same hub and rims on both wheels it will work better. I think my derailleur adjustments were necessary because the cassette position was ever so slightly different between the two hubs.
The longer chain should work fine on the 11–28 cassette. After all the small-small combination is the same, so your rear derailleur should be able to tension it enough.