Are you wanting to match it ballistically, or simply produce a light recoiling practice round? Matching a 110grn to a 90grn ballistically isn't very easy - to match in recoil, you have to run ~22% slower (need to correct for powder mass difference), but then your trajectory doesn't match up. Trajectory really shouldn't matter at all for a defensive load, so I'm prone to assume you're just wanting a light recoiling load.
I developed a practice load several years ago for the Hornady Critical Defense Lite 38spcl load for my Mother-In-Law in her LCR, it's remarkable how little recoil it displays, and accuracy is great. It's a 93grn Meister LRN over 4.0grn Bullseye. If you want to add velocity, I'd have to check the book, but I want to say either 5.0 or 5.3grn Bullseye was the max listed, getting up to 1,100 fps (Lyman 49th). These loaded on my press have been more accurate than the Hornady load, in fact. Seating's a bit of a pain, since the bullet is so short, I liken it to loading 380acp, but once you figure out your case flare, it's bread and butter easy. Specs from the book say this should be 825-850 out of a 4" barrel, but out of the sub-2" LCR barrel, I'm expecting considerably less. I've been content by the burn, no unburned kernels running around, and no notable leading in the bore. Accuracy is great, and recoil is about on par with my 22WMR LCR - plus, it's actually cheaper to feed than the 22WMR, and even rivals the 22LR for cost per shot.
The 93grn Meister LRN, without casting yourself or hunting all over the internet for a supply (the meister's have always been in stock for the last 4-5yrs I've been shooting them), is probably the cheapest and easiest option to get a near-matching load to the 90grn Critical Defense Lite load. Like I said - push 5.0grn Bullseye under it and you'll get yourself within 100fps (book spec in both cases) of the Hornady published specs. I chose 4.0grn just to save on powder and reduce recoil even further.
Another pet load I use is 4.5grn HP-38 under both a Rainier Plated 125grn OR a Hornady 110 XTP. I use 5.0grn in a .357mag case under the same bullets. More recoil than the Hornady CDL load, but still very low recoiling. Velocity doesn't line up for trajectory, and recoil is a bit higher, but still a very light recoiling load with both bullets. I shoot the 5.0grn 357mag load more than the 4.5grn .38spcl load, so I'd have to pull target record to remember how the accuracy compares, but the 5.0grn HP-38 under a 110 XTP is more accurate in most of my revolvers than the 90grn critical defense.