Are all 135x17 needles the same length?

[Quade]

The sticker on my Singer 211A1121  says "135x17 long".  The manuals I've looked at spec just 135x17.    So I'm wondering if all 135x17's are the same length and just have different hole sizes? 

This machine is a bit of a Frankenstein. It once had a thread cutter and back step solenoid. When I got it, both were missing but, some parts of the mechanism are still there.  I've seen other posts about this particular variant here but, not much information in people using them.  I get the impression they came out of upholstery businesses. 

[Wizcrafts]

@Quade, there is only System 135x16 or 135x17. There is no long or short variation. The description "long" might mean longer than tailoring needles, which they are.

[Quade]

I really appreciate the response.