Yes, you're right. The impedance can be/will be different per driver. My point was because the drivers are in parallel, what I measured was the R parallel, so 135.5 ohm is the smallest number you can get. The drivers impedance, if they are different, will be larger than 135.5 ohm, not smaller. The SE5 will not have any issue with TP output impedance.
Just a side note, you actually measured DC resistance “R”, not AC impedance “Z”. But since AC impedance is nearly always higher than DC resistance, your conclusion is still valid.
(Google "measuring headphone impedance" for an in-depth explanation).
So, yeah, congrats on a great match!