Yes it will fit in a Raven.
You'll get a temp difference of 1-2C less at idle.
If you get better temps great.
Choose the exact same fan CM R4 Blademaster.
Buy two totally different fans like Scythe S-flex or Kama Flex PWM. 1200-1600rpm
Most people replace the R4's due to noise 30+db with quieter fans under 30db like 25 db or less.
All fans are push or pull which is both fans mounted in the same air flow direction. <--- <---
intake or exhaust - depending which way you mount it ----> <----
They have air-flow arrows on them for the direction you want the air to flow.