I just mean if the games are broadcast on YESHD and you have MLB EI plus the sports pack, if you can watch the games in HD on YESHD
I was hoping there was someone out of market who would have the definitive answer to this question.
I'm in the same situation and bought the same packages last year. It depends.
For national broadcasts you must watch a national channel (FOX Saturday afternoons, ESPN Sunday nights). Despite sports-pack, ch 622 will be blacked-out unless it's your RSN.
For home games, EI shows whatever feed is available in NY; YES-HD or MY9. Depending on where you are, the EI feed may be blacked-out and you'll have to watch your local RSN (in spite of the Sports Pack). I'm in NC, my RSN is MASN, so I must watch any (home OR away) Orioles-Yankees games on MASN.
Away games vary. Away games vs. other out-of-market teams, you have to watch the EI channel. Sometimes EI carries YES/YES-HD for away games, sometimes it's the home team's feed (which may not be HD).
If it matters to you, much of the YES original programming is blacked-out even w/Sports Pack. You can watch Yankees' Classics (at least during the offseason), but can't watch Yankeeography... I don't remember about CenterStage and other shows.