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Hi,
AT&T is a ksh93 version of the korn shell, pdksh is a mix of (mostly) ksh88 and some ksh93.
The difference between ksh88/93 can be found in 'improvements and additions'. There is a big but......
You need to find out which ksh version (88 or 93) you are used to working with (the UNIX box you mention) and install a ksh version that is similar, otherwise you could run into compatibility issues (some ksh93 script will not run correctly when using ksh88).
Even if compatibility isn't an issue you need to keep in mind that both ksh versions are (partially) not compatible.
Hope this helps.
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