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I often see PAC3 CRI & the PAC3 MSE being used interchangeably. They are very different. The MSE introduces a higher performance, dual pulse, 11-inch SRM, improved LE, more responsive control surfaces, & guidance upg. Overall, it's more agile, faster, with ⬆️ engagement envelope. 
These enhancements 👆are significant enough that MSE's performance agains TBM's is presently limited by the capability of the current #PATRIOT RS. That's why the Army has delivered the THAAD-MSE capability allowing MSE to maximize its envelope. #LTAMDS allow's the same to AIAMD.
The larger MSE missile reduces the launcher magazine size from 16 CRI PAC-3 rounds to 12 PAC-3 MSE missiles. This will likely change once the PATRIOT launcher is replaced but but the current launcher allows for a mix MSE and CRI loadout of 14 missiles 👇
To sum up, MSE is faster, flies higher, is more maneuverable with better guidance & lethality. This enables it to engage more stressing TBM's relative to PAC2/CRI. This allows PATRIOT to extend coverage into MRBM class threats. MSE is the only PAC3 missile presently in production
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