Different alloys of steel can be processed differently to produce tools of similar strengths, qualities, or utilities. Without all the details of the materials and processing, there's no way to determine which tool might be better based on the alloy.
To make matters more complex, terms like "Alloy" steel, "Chrome-Moly" or "Chrome Vanadium" steel are particularly imprecise, generally describing the alloying elements, but not significantly identifying their amounts or providing much in the way of useful information to determine the usefulness of a tool. Sometimes, a tiny fraction of a percent of an alloy will make a significant difference in the finished product.
One more layer of complication: Each of the industrialized nations produced (different) detailed specifications for different steel alloys. Steel mills use these specifications to grade their material and offer materials with predictable characteristics to the customer. Outside of these industrialized nations, US, British, and Japanese grades of steel are virtually impossible to get. Foreign and third world steel mills have no or different specs and wildly varying quality to those specs. The Chinese are notorious for selling steel for structural applications that result in bridge or building collapses because the steel was actually inadequate.
So if a Chinese tool supplier says his tool is made from 4130 Steel, that's a US spec, and you can pretty much guarantee the material he used was not US spec steel. It may or may not be similar in properties to 4130. And knowing Chinese manufacturing and marketing, I would guess its just some ******** somebody wrote on a website with no technical justification whatsoever.
