Temporarily yes - long term i would have to say no - only because i recently had to split two of my boy up and they each spent time in a 120cm cage - although it was ample enough space - when i started to fill it with their favourite things such as pigloo, hidey house, food bowl, sdmall teddy - there wasn't a lot of room for them. A 100cm would be even smaller!
I would certainly go for at least a 120cm sized cage - although 20cm doesn't sound a whole lot more room - it i noticebale if you put the two different sized cages together.
My single boys now each live in a 140 cage :p