According to the linked pages below: Class 2 MLCCs are most commonly made of alkaline earth titanates, specifically barium titanate, along with suitable additives such as aluminum silicate, magnesium silicate, and aluminum oxide.
Do differences in the specific dielectric material or additive affect the specifications of a class 2 MLCC? In other words, can I expect every 0805 50V X7R to behave the same?
Comparing two 1206 X5R 10% 25V capacitors (datasheet links below), there are clear differences in the DC bias characteristics. Can parts be expected to vary more than this?