Probably. I did just as much and took the $2,000 child tax credit that I lost from the spouse's refund. IRS doesn't usually apply the dependent rules about who actually provided the support when there are no conflicting claims to the dependent (i.e. only one person claims the child). In the worst case, you could render the IRS adjustment disallowing it to be moot by amending the separate returns into a joint return, which probably would gain you both more money than just the dependent credit.
