they all have r25-28 wrote on them. the difference is the car it comes out of. it needs to be from a 3.0 v6 omega to be sure it has r28 internals.
there is another marking that is like this
JM 108 98 B
Translationof code below
JM(version code) 108(day of the year) 98(year) B (A-morning shift B-Afternoon Shift)
for it to be r28 internals the first two letter need to be JM, GL, PL anything else and it will be an r25.
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