H-110 and W296 along with W231 and HP-38 are the same powders just lot to lot variations as with any powder,personally I haven't found any difference between lots in those mentioned powders. Hodgdon's is just a brand name,they don't mfg powder,in fact alot of Hogdon's powder is made in the land down under.
Take IMR and H-4227 for an example IMR was made in Canada and H-4227 was made in Australia,however now the brand H-4227 has been dropped from the Hodgdon's line and IMR-4227 is all they carry IMR is not made in Canada anymore but in fact is the H-4227 powder sold under the IMR name,Hodgdon's owns Win. and IMR there various powders are just names assigned to a particular burn rate/application.
When Hodgdon's purchases powder for the Mfg. they purchase it in lots of say 10 box car loads and each lot is tested. Box cars 1,2,3 and 8,9,10 as an example may not fall in a particular burn rate vs. charge weight so they are sold to ammo co. for loading commercial ammo. The remaining box cars of powder 4,5,6, and 7 do fall into the specific burn rate vs. charge weight and are packages as canister powder to be sold to the public.
If you go to Hodgdon's web site and look up any load using the H110 or W296 or W231 and HP-38 where they both are used using same caliber/bullet weight you will see both sets of date for those two groups of powders are exactly the same across the board. And my chrono verifies that with the powders I use.
Here are just a few examples
9mm
115 GR. LRN Winchester 231 .356" 1.100" 4.3 1079 28,400 CUP 4.8 1135 32,000 CUP
115 GR. LRN Hodgdon HP-38 .356" 1.100" 4.3 1079 28,400 CUP 4.8 1135 32,000 CUP
357 Mag.
158 GR. HDY XTP Winchester 296 .357" 1.580" 15.0 1418 28,600 CUP 16.7 1591 40,700 CUP
158 GR. HDY XTP Hodgdon H110 .357" 1.580" 15.0 1418 28,600 CUP 16.7 1591 40,700 CUP
Burn Rate Chart
http://www.hodgdon.com/burn-rate.html