Where replacement of R410a outdoor unit is required, it is possible to use R32 outdoor unit but only if the R32 has been fully recovered and is replaced with R410a. Please note that R410a charge is 20% greater than R32. Please refer to  table 1 on the attached bulletin.
When undertaking such works it is important to ensure that the R32 label is replaced with a label stating that the system now contains R410a
Technical Handbook