Iron fits together, can choose something else?

Question

Iron

I select a cheap office computer with the possibility of "growth", the choice is only on this site
https://brain.com.ua/
my main question is about the motherboard and the processor, well, I don't care about the RAM)

https://brain.com. ua/Materinskaya_plata_GIGABYTE_Z... GIGABYTE Z390 UD
https://brain.com.ua/Processor_INTEL_Core_i5_9400_... INTEL CORE™ I5 9400
https://brain.com.ua/Modul_pamyati_dlya_kompyutera...

as a result of tips and my "I want" here is the build:

• BODY FRONTIER SKYWALKER FC-PA02A–450-W
  
• AC POWER FILTER LOGICPOWER LP-X5, 3.0M BLACK (9590)
  
• MEMORY MODULE DDR4 8GB 2400MHZ ELITE TEAM (TED48G2400C1601)
  
• CPU AMD RYZEN 5 3400G (YD3400C5FHBOX)
  
• ASUS PRIME B450-PLUS MOTHERBOARD
  
• THERMOPASTE ARCTIC MX-2. 65G (ACTCP00006B)
  
• MONITOR AOC 24B1H
  
• KEYBOARD DEFENDER HB-420 RU (45420)
  
• LOGITECH B100 MOUSE (910-003357)
  
• SSD 2.5" 120GB LEVEN (JS500SSD120GB)
  

Answer 1

Can be assembled on AMD, 3200G or 3400G processor, b450 motherboard.