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Yes. The Va numbers indicate the rating of the transformer (12VA indicates that

you can draw upto 12/24 = 1/2 Amps at 24 volts and 20VA indicates that you can draw

about 20/24 = 0.83 Amps). Usually 20va transformer will cost more than the 12va

transformer. So, unless a higher power output is required, it is adequate to use

the lower rating transformer. However, you cannot go the other way - if you use

a 12va transformer in-lieu of the 20va one, if the application needs more power,

then you have a reliability problem. The transformer will have more loss, heat-up

and then eventually burn out.

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