The official wording of the technical regulations are as follows.
Formula one 2020 FIA technical regulations (5.3.
“Power unit mounting may only comprise six M12 studs for connection to survival cell and six M12 studs for connection to the transmission. All studs ‘MUST’ be used and may be fitted on the survival cell, power unit or transmission”.
Formula one 2022 FIA technical regulations (5.4.
“Power unit mounting may only comprise six M12 studs for connection to the survival cell and ‘EITHER’ four or six M12 studs for connection to the transmission”.
In both the 2020 and 2022 regulations the six mounting studs pattern/dimensions (studs centre to centre distances and tolerances) for both front (engine to survival cell mounting) and rear (engine to transmission mounting) remain the same and with no changes. Which means that for 2022 using four instead of six transmission to engine mounting studs will only mean using two less studs. And that both front and rear mountings are still standardised as before.
A note: the front engine to survival cell mountings top four stud holes are on the valve covers top triangular reinforced structure while the bottom two are on the lower part of the lower crankcase. The rear engine to transmission mountings top two holes are on the valve covers top triangular reinforced structure while the bottom four are two on the lower part of the upper crankcase and two on the lower part of the lower crankcase.