[TR] TR3 fan distributor question

[Carl TR]

What is the difference between a 25D and a 45D distributor.  Are they 
interchangeable on a late TR3A?

Thank you
Carl
Project update:
Engine/tranny are back on the chassis
Drive shaft; exhaust; fuel/brake pipes next weekend
Body ready to drop the week after that
Back to the paint shop soon after.
(I sure hope everything still lines up since the trial fit in December)
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Carl - Tampa
1961 TR3A TS81802LO
Body Off Restoration
Completion Date: NATC 2010 (Jekyll Island, GA)
http://mysite.verizon.net/cfmtr3a/
(I need to update my pictures; 11/27/09)