It's a test rig. For all intents and purposes that's a fully assembled breadboard. No case.
Op. Equipment isn't identical or the same as prior, it's different. And setup differently. Sleep mode is nothing more than a low power mode, of which there are several stages or 'states'. When a pc is active, that's C-0. Sleep is C-1 upto C-8. With each successive level, the cpu drops into a lower power budget range, so certain things get shut down, others do not. And that takes time.
Typical C-states are:
C0 – Active Mode: Code is executed.
C1 – Auto Halt
C1E – Auto halt, low frequency, low voltage
C2 – Temporary state before C3. Memory path open
C3 – L1/L2 caches flush, clocks off
C6 – Save core states before shutdown and PLL off
C7 – C6 + LLC may be flushed
C8 – C7 + LLC must be flushed
It can take upto @ 2hrs in sleep mode to hit C-6. The cpu itself will determine exactly when there's insufficient power usage to require active cooling, which could be at C-3 or even C-6 or even never and cpu temps will play a large role in that.
Sleep mode or hibernation isn't Off. Off isn't even Off. Psu Off is the only real Off, because the psu is always active if It is on, as is the motherboard. 'Off' only equates to the OS being inactive. The motherboard and psu must remain in a Standby state of 'On Readyness' otherwise when you hit the 'Power On' button, nothing would happen.
So you can't really compare the new build to the old build, it's different, and will behave differently, within the confines of what's normal for that particular pc build.