Insulated brake pistons

From what I gather, there are two versions of these dual piston rear caliper setups. I'm not sure where the year divide is, but:

organic brake pads with uninsulated pistons and a shim

and

scintered metal brake pads with insulated pistons and no shim

The one on my bike had the shims and no insulated pistons. When I bought replacement pistons, they came with the insulated stuffing.

It should work fine to use these in my calipers by simply removing the shim, right?