GEW/K98's were 90% of the time matching. I have a 1915 Elm stock That was cut down to M38 specs and used. You could not tell if you did not know that 1915 was the year they made them. My GEW was done very well, but it shows some signs, especially the serial number in the barrel channel. The Germans back in WWI used BLO, not a wax based oil as in WWII. It is pretty easy to match color w/ coats. .
Beleive what you want, Maybe Herman Gering hunted w/ it!
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