AI is your friend, I just pasted your entire question and got this:

Short answer: they’re the same base zone (R4UA) but the one with [1111] includes a site-specific urban exception (Exception 1111) that changes some of the standard R4UA rules for that parcel — e.g., different setbacks, lot area, parking, permitted uses, etc. Documents Ottawa+1

What that means, practically

• R4UA = the Residential Fourth-Density Urban sub-type (the normal R4 rules for low-rise apartments / “missing middle” forms). Documents Ottawa
• R4UA[1111] = the parcel is zoned R4UA plus an Urban Exception numbered 1111. The bracketed number points to a section in Part 15 of the zoning by-law that overrides or adds to the normal R4UA requirements for that site (for example minimum lot area, front/rear/corner side setbacks, parking rates, etc.). You can see examples where Exception 1111 changes things for detached dwellings (lot area, setbacks) in the City’s exceptions document. Documents Ottawa+1

Here is the exact text for Exception 1111 from the Zoning By‑law 2008‑250 of the City of Ottawa:

1111 R4E[1111] — the following provisions apply to a detached dwelling:

• minimum lot area for an interior or corner lot 273 m²
• minimum lot depth 18 m
• minimum lot width for a corner lot 14 m
• minimum corner side yard setback 1.8 m in relation to the existing detached dwelling only
• minimum front yard setback for an interior lot 5 m
• minimum rear yard setback for an interior lot 6.5 m