Can non-cross linked hyaluronic acid products still cause vascular occlusion?

While I understand that non cross linked HA products and dermal fillers have a different purpose, are products like Juvederm Hydrate, Belotero Hydro, etc, etc safer? Any surgeon care to explain the science behind it? My understand is that fillers that are cross linked are more likely to lead to vascular occlusion if they are injected by a poorly training beautician as they swell up? I can see my local beautician is offering belotero hydro for an excellent price.