More time posting than coding
If the pension provider has no objection to you making further contributions then there isn't anything else to stop you from doing this. Providing the pension provider will accept gross contributions from your employer (in this case your limited company) then that will be fine - it makes no difference to HMRC what the pension is called.
You can contribute up to £50,000 to your pension this year - this will affect how much dividends you can take from the company as the profits will be reduced by whatever you contribute. If you don't intend to contribute significant amounts to the pension (less than the salary that you are taking) then it may be more tax efficient to make the contribution personally rather than through the company.
Hope this helps!