C4 oil pan gasket. What's early, what's late?

[smh00n]

How do I tell what C4 I have? All I know at this point is it's a case fill.

It's not original to the car and is supposedly a year or two later so that makes it circa 1972.

I need to replace the oil pan gasket ans not sure what the difference is.

[Nuts]

Gaskets are the same. Filters are different.