It shouldn't make any difference. It has been done commercially with peach trees in the States, and is quite common in fruit trees from other families, particularly apples. This type of grafting is called "topworking" and as well as "recreational" use (making your own family tree, with several varieties on the same tree) it is used commercially either to reinvigorate a tree that isn't fruiting well, or to replace or add a newer more productive variety, or occasionally to include a pollinator in a self-incompatible tree. If your apricot is of an age where it's already got stout bark, you might do better bud grafting in winter than trying cleft grafting.