I have obtained both. The newest versions were obtained directly from Lanier. There is no way to tell from the outside. Same product number, photos, etc.

Here are the differences I've noticed:
Firewall is comprised of three laminated pieces of 1/8" light ply for a total thickness of 3/8". It appears to have been toothpicked (2 on both sides. The firewall fiberglass is now on the outside and wraps around to the fuse (1/2") The wing hold down and gear plates are 1/4" light ply. There is 1/16" ply on both sides of the fuse where the tail mounts. I cannot tell how far forward it goes because a former is in the way. The tail is 110 degrees instead of 100. The tail tapers to a point more so compared to the 1/4" flat tail on the old ones. The covering appears to be thinner. I have not touched it with an iron yet to determine the correct temp. Old kits were high temp ultracote. The wing looks to be made from a single piece of foam instead of two pieces sheeted separately and then glued together like the earlier kits. No seam at center. The aileron torque rods are 4-40. The landing gear is now slightly larger and stiffer than the standard L-1 gear.