I wouldn't presume Prevost is more doctrinally conservative than Francis, just because Francis wasn't as liberal as popularly claimed. Rather, American conservative bishops attempted to paint Francis as doctrinally liberal as part of their rhetorical strategy to attack Francis' non-doctrinal liberalism (e.g. on high-profile but non-doctrinal matters related to discipline, liturgy, etc). Similarly, progressive activists chose to interpret Francis' policies as doctrinal shifts, when they weren't. Though it's possible the latter phenomenon was something Francis was content to leave uncorrected. Francis seemed to embrace ambiguity in his pronouncements as a method of rapprochement.