Important to note that the CPU speed there is not apples to apples - the V1 is MIPS based, the V2 is ARMv5 (Marvell) - so the memory footprint and binary sizes can be different.
The V2, if I recall, it is a 3*3 on both bands, whereas the V1 is 2*2 in 2.4Ghz, and 3*3 in 5Ghz.
Both are fairly decent for a Linksys device...
Funny the box reads 6 ANT but that's 3x for 2.4GHz and 3x for 5GHz.
Both E4200V1 and EA4500V1 read the same. CPU does help for DLNA, downloading more robust on the EA4500V1 than it was on E4200V1.