KAAN has more stealth capabilities than KF-21
Radar cross-section estimates of 5th generation Fighter Jets and their sizes against living beings from smallest to largest:

Tarantula (Spider) ▸ -40 dBsm

F-22 Raptor ▸ -40dBsm

F-35 Lightning II ▸ -23 dBsm

KAAN ▸ -25 dBsm ... -5 dBsm target

Eagle (Bird) ▸ -20 dBsm ... -10 dBsm

J-20 Mighty Dragon ▸ -20 dBsm ... -5 dBsm

SU-57 Felon ▸ -10 dBsm ... 0 dBsm

Human ▸ -5dBsm ... + 5dBsm
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KF-21 doesnt have internal weapon bay for stealth flight capability
KF-21 can not carry Bombs , Cruise Missiles and anti-radiotion Missiles in stealth mode for Air to ground attack and SEAD-DEAD role
View attachment 156152
S.Korean KF-21 technology
-- Engine from American GE
-- AESA Radar technology from Israeli ELTA Systems
-- Terrain-following/terrain avoidance (TF/TA) Systems from Israeli ELTA Systems
-- IRST sensor head unit from Italian LEONARDO
-- CANOPY technology from American TEXSTARS
-- AMADs from American TRIUMP GROUP
-- HELMET from USA
-- Main Generator from American COLLINS AEROSPACE
-- Missile ejection launchers from British COBHAM
-- Ejection Seat from British MARTIN-BAKER
-- Wheel braking system from American MEGGITT
-- Air to Air Missiles from USA and Europe
-- Cruise Missiles from USA and Europe
even simulation link system from Turkish SDT Space and Defense Technologies
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-- RAM ( Radar Absorber Material )
KAAN is coming with advanced magnetic coating and RAM panel layer
View attachment 156149
-- Air inlet Ducts
KAAN has S routing duct to hide Engine comprassor blades from direct enemy radar signals .. also RAM coating on inner surface of du
View attachment 156147
--Internal weapon bays for stealth flight capability