Is it possible to have 2 instances with the same name but different edition in the same server?

Hi everybody!
I have in a little trouble ....
*** Scenario.
Oracle Enterprise Edition 11gr2 over Oracle Solaris 11
3 instances: PROD, QA, DEV
1 ASM instance
Listener ports: 1520, 1530 & 1540
           Those are production system
*** The problem:
Customer can't pay Oracle EE, they want to change to Oracle Std One
Limitations:
I cant have a similar system to test.
*** My idea:
Install Oracle Std One, in the same path:
/u01/app/oracle/product/11.2.0/db          <-- EE
/u01/app/oracle/product/11.2.0/db_one   <-- Std Ed One
ASM:
/u01/app/11.2.0/grid          <-- EE                    +ASM
/u01/app/11.2.0/grid_one   <-- Std Ed One        +ASM1
Create databases:
Asign similar disks to +ASM1
Create DGs on +ASM1
Create databases: PROD, QA, DEV for Std Ed one
- is it posible that they have same instance name?
- if not, i suppose create as: PROD1, QA1, DEV1
Configure Listener port : 1521, 1531 & 1541
Migration technique:
Create Tablespaces, schemas
Lock users in EE
down listener: 1520, 1530 & 1540
Import data of final users in a window maintanance
configure and up listener: 1521, 1531 & 1541
Customer should test access and apps in new
Please tell me if my Idea is reallistic, all comments are going to be very apreciated.

sol.beach
I suppose end customer use a port per database in order to separate in a logical way the access to the databases,
i mean PROD, QA & DEV has the same users.
Hemant K Chitale
1. I've seen physical servers with 3 ASM instances: +ASM1, +ASM2, +ASM3
   on Solaris & Oracle 10g, I suppose is posible on 11g
2. The sever has occupied 2  sockets (2 physical CPU), so I can use Oracle Standard Ed One.
JohnWatson2
Thanks for your comments.
WadhahDaouehi
1. - You cannot run two ASM instance simultaneously on one Server, but you can run many Oracle database simultaneously
      on the same server which they use the ASM as storage type.
  As a mentioned to  Hemant K Chitale, I've seen a system with several instances running
  About
     "you can run many Oracle database simultaneously on the same server which they use the ASM as storage type."
  I'm not sure if i can use the same ASM which is part of a current Enterprise Ed over the new installation with Oracle Std Ed One.
2. - Why you want the same instance name?
If it is about the service name, which has by default the same instance name, just you can create a different instance name
and create the service name with the name that you wish.
SQL> alter system set service_names='instance_name';
Is a similar name, not the same
PROD, QA & DEV
PROD1, QA1 & DEV1
I consider add "1" at the end to refer "Oracle Standar Ed One"
But I agree with you, i can customize throught service_name.
Regards,
Abraham Mtz.

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