yes, mostly, yes. I think it's only difference is the kind of feelings they give and the kind of sentences they are in. เสมอ - general sentence, in simple tense. give the feeling like 'always do/be something/often do/be something'. (mostly used in formal writing) ตลอดเวลา - general sentence, also in simple tense. but give the feeling like 'always doing/being something'. ทุกที - complaining-like sentence. give the feeling like 'always doing/being something every time'.