Shell Helix Ultra 5W-30 Specifications: API SL/CF; ACEA A3/B3, A3/B4; BMW LL-01; MB approval 229.5, 226.5; VW 502.00/505.00; Renault RN0700, RN0710. Meets the requirements of API SN/CF
Shell Helix HX7 Professional AF 5W-30 Specifications: API SJ; ACEA A1/B1; ILSAC GF-2; Ford WSS M2C913-A, WSS M2C913-B
These specs are obtained from online source and may not be same as yours and by looking at them, ideally no you shouldn't mix these oils.