I caught the second rabbit! The first rabbit is also getting thicker, so I don't know how much it will end up weighing. When I first weighed it, it probably hadn't eaten for a while.
		
		
	 
Do you know what gender the second rabbit is?
A second cage would probably be a good idea, since the first rabbit is male.
Two adult males usually don't share a cage peacefully unless they're neutered (since we don't know their ages, I don't know how long you would have before this happens).
A male/female pair usually produces lots of babies. (If the new one is a female, she might be pregnant already, but if she's too young now she will almost certainly get pregnant at some point. And having a male in the cage when she gives birth can be dangerous to him, if she tries to drive him away; or to the babies, because he doesn't know to be careful fo them; and he will probably mate with her as soon as she's given birth which means another litter a month later.)
I don't know what breed the new one is, quite likely a mix, but it's pretty! There's a chance it could be a broken New Zealand ("broken" is the name for the spotted patterns.)
Breeds the new one is not:
Checkered Giant (spotted breed, but body shape looks wrong)
any breed of Lop (ears are not floppy)
any breed of Angora (does not have wool)
Rex (does not have extra-short fur)
any "Mini" or "Dwarf" breed (too big)