Old, will rarely match new. If you want them to match perfectly, you should have poured all new. I would leave it alone now. Grinding wont help much.

" I'm inexperienced with concrete work."

For several reasons,that suprises me. 90% of the time there will be differences in color and texture between old and new concrete. Grinding remove's the thin layer of high % portland and fine sand consequently making concrete subject to water intrusion,freezing and spalling. Just below that is much larger aggregates (the one's pushed in while jitterbugging). At this point you not only have a different color, you have what's known as exposed aggregate which is pretty but doesn't match. I have better solutions than grinding but it seem's you and I march to different drummers so I fear communications would be difficult.

I appreciate all your input. I'm completely open to other thoughts or suggestions. Not sure what kind of impression my "inexperienced" comment is giving off, but I would love any and all suggestions. 🙂

Looks like a nice job, I like the curve. Leave it for a full year then decide. Paint or stain is possible but not yet -- patience!

Thanks, I now realize I'm probably jumping the gun a bit and focusing in on something that may be overlooked by a passerby. I think you're both right -- giving it some time will help me better determine how important or noticeable this difference is.

+1 on no grinding.

The bottom step looks like a powerwash might help it. The door landing can't tell. But at a later date you can apply a concrete resurfacer and it will hold well in a warm climate.

Don't paint it. A never-ending chore.

I redid a section of concrete out my entryway. Section closest to the front door is the original and left that, just reconfigured the walkway. After a few years it's coloring is similar to the older concrete even with a different texture. It's slightly different but not enough to drive me crazy. I doubt anyone notices the difference except me. I say give it a year or two and it will be similar enough.

Power wash the older stuff. But wait until next year after new stuff is fully cured so it won't get damaged if you get too close.

Thanks for all your suggestions and insight. It def helps me settle my concerns.