The usual confusion in designation of mandolas:

Most "mandolas" are tenors, tuned CGDA, with scale lenths of about 20 - 21". Some octave mandolins are called mandolas, tuned GDAE, but generally with scale lengths about 23".

A scale length of 21" will not readily take GDAE tuning; although you can up the string gauge, they will still be too floppy to give decent volume and tone.

Similarly, the string gauges for CGDA tuning for a 23" scale would be very thin and breakable.