Is the ATMEL 89C2051 equivalent to Intel 8051?

I found a code Downloader for a ATMEL 89C2051, but I have 2 microcontrolers 8051 and 8031 to work on.
Can I use this device for both?

Thanks in Advance.
:shock:

89C2051 has the same core as that of 8051/8031. The only differenece is that it has 2kB of FLASH ROM and has only 20 pins. Rest everything is same. You can use it in place of 8051/31 provided that your code does not use port pins which it does not have.

Standard 8051 - 4k EPROM/OTPROM
Standard 8031 - ROMLESS