Would you install a fr brake caliper that has different sized pistons?

The rebuilt calipers that I got for the truck, ls failed and they claimed to have no cores available.
They overhauled the blown caliper and when I get it back I find the lower piston is larger than the upper (you don't need a micrometer to see the difference) looks as though they have over-bored the hole and put in a bigger piston.
To my mind, this is not the way it should be, if your going to resize 1 piston, I would think you would need to do all 4 otherwise there will be dissimilar braking forces, no?

Everyone just keeps telling me to install it and it will be fine but I know that when the inner brake pad is smoked on an angle, 20K from now, no one is going to offer me free replacements.
Let alone all the other parts that will have been damaged in the process?

I would post a pic but don't know how, don't have a photo bucket account and am allergic to technology.
Just picture in your mind a 2 piston caliper where the upper piston is normal and the lower piston is a good 1/4" larger diameter (at least the part that sticks out of the seal)
Would you install it on your truck?