Both those words have several different meanings. Are you only interested in the literal meaning, where they are similar? To me - 'to angle' means to position something at a particular angle. 'Angle it so that it it catches the sun'. 'to tilt' can be the same as 'to angle', but more often is used more as 'to angle at a slight angle'. 'No, not upright, tilt it a bit so that it doesn't fall over'. 'Like this? No - tilt it towards me a bit more'. I hope that this is clear - please let me know if not.

They are synonyms. Depending on the situation, one may be more appropriate than the other. Do you have a specific situation in mind?