The Prep Bible.
These two units fit different platforms. Read this as a line-vs-line breakdown, then pick the version cut for your own setup.
The Safariland Schema IWB Holster 19-179-411 is built for the S&W Shield/Shield Plus, right hand draw, in black. It's an inside waistband concealment holster designed for shooting use.
The Safariland Species P365 XMacro IWB Holster 20-565-701 is built for the Sig Sauer platform, made from Cordura, suede, and polymer, in a Multicam finish. It's listed for both inside waistband and appendix carry.
These are two different Safariland lines cut for two different guns. The Schema is Shield/Shield Plus specific with no material breakdown given, while the Species P365 XMacro is Sig-specific with a listed multi-material build and a wider carry location listing that includes appendix. Price also differs, with the Schema at $51.99 and the Species P365 XMacro at $66.49.