Making a repair look more seamless

[AgGEM]

I'd agree on a face repair. On an edge repair such as this it will constantly swell out with seasonal changes in Rh.

Ah! Good point. I would not have considered.
Ag

[Steve N]

That was before OP told me my eyes were all wrong, and that piece is stone flush to the side. Still doesn't look like it to me, but I am an old fart.

[7DWW]

Burn in sticks are fairly easy to use and will resolve your "feel" issue.

https://www.amazon.com/Quick-Fill-Burn-S...+in+sticks

you can get away with using a lighter to melt these but an iron and knives are a good investment.

These are great markers that come in many different colors. the tips of these markers offer excellent control. and you should be able to replicate the surrounding grain pretty easily.

https://www.amazon.com/Mohawk-Brush-Tip-...ing+marker

Obviously play with both on a test piece and I'm pretty confident you will be able to make even some of our worst mishaps appear seamless, even you will forget they are there or at least be proud of overcoming it