Well, it depends. New ISR-G2 8xx routers usually are not modular, so no modules are supported.
19xx, 29xx and 39xx routers should share most of modules between them, but it could happen that 39xx support more modules than 19xx (19xx has no service module slots at all, while 3945 has 4 service module slots).
And... there is also 4451-X which beats all of them. :)
You should search Cisco website and/or contact any Cisco representative.
_________________ If you can see any inaccuracies or other language-related mistakes in my post(s), please forgive me - English is not my native language
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