Having the graft taken is like having a muscle tear of the hamstrings. So you'll now have bilateral knee pains. The graft is theoretically no different. But because you'll have 2 'bad' sides you'll have to proceed slower and will likely spend a bit longer on your crutches.
The ACL side could heal quicker as it hasnt had the hamstring surgery on that side. But overall I would think you'll be out of action a bit longer.