It would be good to know what car you have. If you're driving a W123 like me it specifies Dexron II which is what most bottles sold as standard ATF are. Even if you have a newer model that rquires Dexron III I don't think topping off with Dexron II is any great calamity. If you did a fluid change with the wrong stuff I would say drain and replace. It's much cheaper than a premature transmission rebuild.

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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!)

'95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs)

Deuteronomy 22:4-
"Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again."