I haven't dealt with solar technology for many years & wonder if there have been any improvements made since my last dimmer-than-dim solar lights died & were ditched way back when.

Rarely do a set have equal brightness.
And even the good ones can start to fail quickly.
And styles change so fast you might not be able to match the others in the set.

Low voltage is still the better way to go IMO. Cheap safe and they work. Some of the better systems are really bright.

Here's a link to a discussion a while back on the Landscaping Forum where I contributed two posts (jkom51), near the end. Note my points on siting them however -- if you don't have the right site for them, you're wasting your money.