LSD refers to the compound lysergic acid diethylamide - a psychedelic drug.
Acid is a street/slang name for LSD.
LSD and acid are used to mean the exact same thing.
In research, LSD refers to the pure LSD compound, but on the street, just because something is called LSD doesn’t guarantee it contains any LSD - nor does it guarantee that it contains only LSD.
In the same vein: If something is called acid, that doesn’t necessarily mean it’s not real LSD, and that doesn’t necessarily mean it’s pure LSD.
If you’re using LSD/acid, it’s always a good idea to test your substance.
Are the effects of LSD and acid the same? Yes, assuming your LSD is pure and your acid is pure LSD!
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Have more questions, or want more resources and info? Visit /r/PsychedelicTherapy or /r/Psychedelics.