My experience with "soft" items at the pick n pull (such as hoses, many rubber bits, vac lines) is that they tend to be in worse condition than the ones that busted on the car in the first place !! I never pull items like vac lines of off dead cars at the wrecking yard simply because these cars often have far more use/mileage on them than my cars do !
As long as you have photographs of the original lines and where they are routed to/from, and perhaps make a notation of this information (example attached from my M117 Top-end Rebuild) about vac lines on an engine, there is ABSOLUTELY no problem using regular vac tubing of the same diameter to replace color-coded vac lines.
Of course, if the color coded stuff is still available, great, but only a fraction of the original color coded lines are currently available from MB. I think about 50-60% of the original colors were available when I did my M117 rebuild.
You can see the check marks and on the M117 table the hashed-out check mark that served as a "double-check" that I had correctly routed the vacuum line. Never hurts to double-check one's work as a mechanic.
Cheers,
Gerry