Present perfect and/or past simple?

[Will17]

Hello,

Can we use the Present Perfect and the Past Simple interchangeably, here please?

“Pleasefind attached the updated version of our document:


- we have made a modification in the first chapter,

-we have looked at your information but these assumptions were not the same as the previous forecast,

-we have calculated the amortisation,
-we have included the new recruitment."

Thank you very much
Will

[Will17]

up

[Barb_D]

In this case, yes. They are recent and relevent to the current sutation, making present perfect okay, but they are completed actions in the past, making simple past okay.