This is why edge blending is incredibly difficult to get correct and why projectors are so finicky. Color accuracy, even within the same brand, is VERY difficult with projectors and these types of models are in no way designed for color matching from model to model to model. Just putting two projectors side by side typically shows a very clear difference in the white balance and color accuracy.

It's important to use a proper colorometer and to do very accurate color matching, especially in white balance. Even then, it may still be off some because it tends to be higher end models which have better color rendition and ultra high end models are specifically lamp-matched and use sequential serial numbers on models to ensure they come from the same batch and are more likely to have dead accurate color matching for edge blending setups.

It's tougher than some think it would be.