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Yeah, essentially RP ratings are focused more on their top couple pitches, whereas SP ratings are more based on depth of pitches. So if your guy is a junkballer who throws 4 mediocre pitches, he might be rated higher as a starter than a reliever.
Otherwise, ratings may be different as by default the ratings are relative, so if relievers are rated higher than starters (which they generally should be), then the ratings will be a little lower as a starter.
And overall, if the guy is not doing well as a starter, there's a few reasons for that. One might simply be sample size - maybe he just had a couple bad starts. Another is that starters will just naturally have worse numbers - as mentioned, they throw softer, to save energy, so won't be quite as effective when they pitch. And batters get a bonus against them the 2nd/3rd/4th time through the order, so the deeper he goes, he'll probably get rocked at some point. And if the guy has a low/marginal stamina, it might be that he's doing well early, but then tires out and gets bombed a 3rd time through the lineup.
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