If you read my website, then you also read all over it - "Do not mixed dwarf with clawed"

Laevis and borealis have a few differences - size, coloration, and availability.
Size - Laevis up to 6 inch, Borealis up to about 4.5 inch
Coloration - Laevis = natural/wild type spotting of brown/green, albino, reticulated albino, leucistic, piebald. Borealis = only natural/wildtype which is a grayish blue body, with a blue sheen over it, a yellow underside with gray/purple spotting. Laevis generally do not have spotting on their undersides.
Availability - Laevis is the one you find in pet stores. Borealis is usually found by tracking down a breeder - I have not heard of Borealis in stores.

Most stores cannot even tell the difference between Dwarf and Clawed - never mind different species of Clawed!

Again, unless you upgrade your tank, the 5 gallon is not even suitable for the one frog you have remaining.

Dwarfs and claweds should never be mixed for the safety of the dwarf frog. Doing so is for the benefit and enjoyment of the keeper, not the animal.