Yes, in general you can use 38 data in 357 brass. It works better with 158 lead bullets than it does with 125 jacketed. Low charges and light jacketed bullets generally are a bad combo in magnum brass.

Using medium speed powders (Unique/N340/HP-38) and light jacketed bullets I like starting 357 data minus 1 grain, which saves a lot of working up from 38 loads.