Hi! I already had one second-hand bike, and then I bought a new second-hand bike. I don't know much about bikes, so excuse me if I'm asking nonsense. I want to sell my old second-hand bike, but its tires (42-622) are really worn out, and I had a lot of flats during my last tour. It has a Dunlop (Woods) valve. I want to use the tires from the new second-hand bike. It has a French (Presta valve) and the tire size is the same (42-622). And buy new Schwalbe Marathon tires (40-622) for my new bike.

1) Can I put 40x622 tires on my new second-hand bike?

2)Can I put my tires with a French valve on my old second-hand bike with a different kind of valve?

Thank you.