There is no problem using two types of yeast, just remember though that yeast is the most dominant taste controlling factor in any beer and even more so for a wheat beer. All those clove banana flavors come from the yeast so mixing yeast will mean that you will have a mix of the two flavors provided by the two different yeasts. Not that it is bad just that it might not be what you are after.
The coopers forum says that the coopers wheat extract comes with yeast labeled, Wheat - A (26807 W) I tried to find more info about how similar this is to other strains but got nothing.
Remember that if you are brewing a wheat beer to control the temp really accurately to control the flavor profile specific to what you want. High range temps = Bananas lower temp range = apricots and spices (just my opinion)