Fisrt of all, thank you for replying, Gene. In fact, I'm trying to use this kind of tender to turn my Pacific into a private railroad, but I'm about to give up on it. 
The wire bundles female and male, matches, no problem, just their shapes seems to be a bit different, at least it's what their colours suggest. All the others Spectrum steam locomotives have "orange" bundles, while this Pacific is white coulored. I guess there is a reason for that, but no problem, all the DCC card can be switched if I get over the draw bar difference.
Btw, wires come from the tender, in both cases.
This Pacific draw bar is completely different, it looks like a double "y" 180° opposite, so both ends are equal and there are posts on both (4) ends; so no matter the way you assemble it, you'll get the same end shape. Weird, I may say
I'm starting to think I better let it as it is and use this tender in another locomotive.
Thank you for your time, once more.
Temp.

I have a K4 "Pacific" locomotive (Spectrum, item #84013) and i bought a Vanderbilt long tender for it (Spectrum, item #89911), but the coupler tabs just don't fit, besides wires connections seems to be different too. Does anybody knows something about this?

Thank you

Steam is "infectious", buddy! Welcome on board!

Hi all!

Yes, I got you Gene, that's why I'm still hoping it will work fine when used on my loco, just felt like trying out first to get a bit used to it. I got
"two left hands", as i said first.

I think i'm using the right "pencil eraser" type, they are also called typewriter ink eraser over here too (Brazil). They look different, but their points seems to be alike, as far as i could tell by the pic.

Thank you all, once more!

Hi Lanny!

Thanks for the explanation and congratulations for those precious UP pics, i'm not exactly an UP fan too, but i'm definetly a steam fan.

Well, I've tryed both methods (BillD53A's and SteamGene's), besides an acetone base solvent as well. You're right, the surface always "suffers" a little, but i have to say i'm not an expert. I've used an old rolling stock as a "guinea-pig", so my loco is still "untouched".

Thank you all, i think a little more practice will does it good.

Cheers!
Tempest

Yes, it's a steam loco (0-6-0 saddle-tank), i'm sorry i've forgotten to mention it.
Tanks a lot! As a "two left-handed man"  I'll first try the pencil eraser if i don't succeed i'll try the curved edge hobby knife.

I need to remove "only" the road name from a Spectrum loco, without damaging the below painting (i couldn't get an "unlettered" one). I've seen such a work once but i have no idea how to do it or what kind of "solvent" i can use .
I'm not in the USA so brand names won't help that much, i'm sorry.

Cheers!