Yes, it shouldn't be a problem as long as the connection interface is the same (i.e. SATA).
buwish - You are correct. Everything works perfectly.
I installed a Western Digital Scorpio Blue 160 GB (PATA -compatible with IDE) - in my IBM ThinkPad T23 that had a limited available HDD capacity at time of manufacture.
Thank you so much for your rapid and informative response.