I've looked in the dictionary about the meaning of these 2 words, but I can still not process how they're different.

For example, when should I use up? If the word match up means the same as match already?

The prices in-store do not match with the prices online.

The prices in-store do not match up with the prices online. (Not very sure whether this is natural speech).

When are our time zones ever going to match? (Be equal)

When is our time zone ever going to match up with each other? (Not sure about this one either).


All of these are perfectly good, the difference is stylistic and local idiom.

It's very similar to head an organisation and head up an organisation: identical in meaning, slightly different in style.

(But the differening time zones are plural: "When are our time zones ever going to match/match up")

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