using Mouse over to select a target 3.3.5a

[Hrap]

Hello everyone, I decided to port the bot from classic to 3.3.5.
I'm having trouble using the Mouse_Over_GUID global offset
When I write the GUID of a mob into Mouse_ower_GUID and then click on interaction with the mouse pointer, the mob is not targeted

Mouse_Over_GUID = 0x00BD07A0;
Unsigned __int64 mobGUID = GetClosestMobGuid();  // Returns the GUID of the nearest mob, 8 bytes in size
if(moGUID>0)                                                                      // If the result is not 0
{
WriteBytes(Mouse_Over_GUID, mobGUID, 8);                // Write the resulting GUID, 8 bytes in size, into memory
PressActionKey();                                                               // press the key to interact with the mouse cursor
}

In this case, the data is written to memory at the current address, but nothing works.
What am I doing wrong, what byte size should the GUID have?
This method works great in classic wow but does not work in 3.3.5. in classic Wow the GUID is 16 bytes

[qop1832]

The GUID of a 32-bit client is 8 bytes.