If you have a ring tester, it would be a lot easier!

a) Number the pins on the transformers anyway you like
b) black probe on pin 1, red on pin 2 – record ohm
c) black probe on pin 1, red on pin 3 – record ohm
d) black probe on pin 1, red on pin 4 – record ohm
e) etc
f) black probe on pin 1, red on pin last – record ohm
g) black probe on pin 2, red on pin 3 – record ohm
h) black probe on pin 2, red on pin 4 – record ohm
i) etc
j) black probe on pin 2, red on pin last – record ohm
k) black probe on pin 3, red on pin 4 – record ohm
l) etc
m) finally, black probe on pin last-1, red on pin last – record ohm

All transformers should match. Some will read 0.3 ohms which is normal.