Munster claimed the interpro bragging rights with a last-minute win over Ulster in the URC last night.
Tom Farrell's try two minutes from time helped the visitors to a 22-19 win in Belfast.
This evening, Leinster and Connacht go toe-to-toe at the Aviva Stadium.
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RG Snyman and Jordie Barrett both start for the hosts, while the Westerners welcome Bundee Aki, Mack Hansen and Finlay Bealham back to their starting 15.
Kick-off at the Aviva Stadium is at half 5.