There have been something like that on this forum already. Conclusion is unfortunately like that, there is no easy way to convert old kit into new one. Theorereticly it's possible to build a program wich will cut old kit into pieces streach in some areas and fit into new form. But new kits are longer (when it's untacked) has undersleeves, undershorts (?) and necks, that didn't occur in fifa 10. So, if some good editor will be bored, he may create such a program. But when it takes Rinaldo half a year to release CM, there probably won't be any bored editor untill summer holidays.