CDM4 laser replacement

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Hi,
I need to substitute a laser diod from a Philips CDM4 unit installed on an Orelle CD 10T transport mechanics.
I found some NOS units, CDM4/19, /31 and /53.
Someone told me they are all compatible, while some other told me the opposite...
Does anyone know where I can find the /type printed info ? I opened the box, but did not find such info. Or, do you know if all lasers of all CDM4/x are compatible ?
Thanks a lot
giuseppe
 
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