[Grammar] Once / as soon as

[MAJSH]

I am currently developing CRM functions. I will develop HRM modules once I have finished the CRM functions.
I am currently developing CRM functions. I will develop HRM modules as soon as I have finished it.

Are the above sentences grammatically correct and same meaning?

 

[Yankee]

Yes.

 

[5jj]

I am currently developing CRM functions. I will develop HRM modules once I have finished the CRM functions.
I am currently developing CRM functions. I will develop HRM modules as soon as I have finished it.

Are the above sentences grammatically correct and do they have the same meaning?

The parts I have underlined would be more natural as 'them'.

'As soon as' implies a quicker move to CRM functions than 'once'.