Lilac ID?

I purchased bare-root primrose lilacs in 2018.  They have finally come into their own and are blooming this year, but they are not primrose lilacs.  They have all the traits of our common lilacs except for the blossoms.  These are pale pink as buds and have opened to these beautiful star-like blossoms, but I cannot find a match for them online.  Does anyone happen to know what variety they might be?  I photographed a blossom next to one from a common purple lilac bush.