That would be 3 to 2 and 3 to 3, but I am not used to seeing a colon in sports scores. The colon is usually used in ratios.
The ratio of boys to girls in the class is 3:2 (three to two, 60 percent to 40 percent).
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For example, in a football match the score is 3:2. How do we actually read this score out?
How about 3:3?
3:3 is usually called "three all" in many games.
...and It's usually written 3-3.