From what I could find, the famicom with the text label should be it, should be from 1982 as well I believe. That's the best I've got honestly.

You are using PRG0. You can't do the skip on Stage 3 in the PRG1 version. Your run on the leaderboards includes this skip, which means you are 100% using PRG0. Hirexen states this in this thread: https://www.speedrun.com/dkjr/thread/3dp9y

While I have no idea how to identify them via physical features, you can play them to easily find out: if you can do the skip on Stage 3, they are PRG0. If it's impossible, it's PRG1. I started with a PRG1 ROM myself so I can verify this, as I had to locate a PRG0 one for that exact reason: Stage 3 skip.

We'll put Hirexen and Lojen's comments aside, Hirexen is a mod but Lojen holds WR so his abilities exceed most. I invite you to attempt this Stage 3 skip on the Donkey Kong Classics version of DK Jr., as you are underestimating the difficulty of it, if it's even possible. I have stood there attempting thousands of jumps, not one succeeded. This is far from the "3 fails" you claim that makes you think this version is PRG1. Once again, you need to locate a PRG1 version of this game and attempt it, and you will see the difference for yourself.

But let's focus on "Is SalaryMan using PRG0?", and you have further proven the answer is yes with this link: https://tcrf.net/Donkey_Kong_Jr._(NES)

The color of the fruit only changes when they fall. The key factor to focus on is the color of the chains. I have taken a screenshot of your video, and overlaid both images from this website of the PRG0 and PRG1 versions. Compare the chains on the side of the level, as well as the ones you climb:

Another way to test that I can show in a video if required: Hold Select at the main screen. If your cursor keeps scrolling, it's PRG0. If you hold Select and it only scrolls once, it's PRG1.

Here's that Select test in action. I think this is really the easiest way to tell:

I hope that helps more than my original post!

Based on what your video is showing, your cart is behaving much more like PRG1 than PRG0. I attempted to perform the backwards jump on Stage 2 as you did, and he does indeed backwards jump onto the ropes and glitch high enough that the only way to get out of it is to fall and die. In addition to this, your select test is like PRG1, as well as you having the press right for those skips (in PRG0 it's quite easy and you only press down).

While your stage 4 still looks more PRG0, this is the only thing, because your game definitely doesn't behave like PRG0. I can show you what PRG0 does in most situations (down + A normally jumps right regardless of which direction DK Jr faces, not always backwards though).

I'll have to look into it a bit more, but yeah I'm glad you posted that video. I would say whatever versions those are, they definitely are not PRG0. I know you use original hardware, so the only thing I could suggest to find a true PRG0 version if you're interested: you could grab a PRG0 version online and put it on an Everdrive.

Was there any more information found about the PRGO version cartridge? Been wanting to get the actual cartridge for a while now. If not I will most likely get the text only "Pulse" label cartridge.