These maps were made by Anthrogenica's user Passa.
R1b-U152 and its subclades Z56, Z36, L2. Unfortunately, no map of Z192.
Z56 is considered Italic, Z36 Gaulish and L2 more continental Celtic or Italo-Celtic.
Given the R1-U152 subclades distribution in Passa's maps, it seems reasonable to suppose:
Z56 is likely a proto-Villanovan/Italic subclade, as its higher distribution in Central-Southern Lombardy, Emilia, Tuscany, Umbria and Northern Lazio shows.
Z36 is likely a Gaulish subclade, the last wave of Gaul-Celtic people who settled Northern Italy, and to some extent Central Italy (modern-day Northern Marche)?
L2 is likely the oldest Celtic or Italo-Celtic subclade in Italy. In Northwestern Tuscany, Southeastern Liguria and Southwestern Emilia L2 is clearly a Celto-Ligurian subclade. Also very high its distribution in Northwestern Piedmont, and Northeastern Italy (Trentino-Alto Adige, Veneto, Northern Friuli).
Maciamo's phylogenetic tree of R1b-U152.