ABY and AAN valve covers and throttle body...

[Gerard]

How different are these 2 groups of items?

Are they interchangable? AAN valve cover looks like it has more space
under the inlet side of the cover, i.e. doesn't slope off like ABY
(where the coil section really pokes out), and that's about it as far as
I can tell. Want to slap one of them onto a 3B head (when the darn thing
finally arrives).

As for throttle body, my thinking is that the ABY and AAN TB is the same
really. Part number "034 133 063 EE" versus "034 133 063 EF".

Sorry, I just don't know these engines. :)