I don’t think it’s advisable to submit new application while you have one application in progress. It’s clearly stated on IRCC official website, having duplicate application lead to delay in both application.
And also I believe most people are getting something wrong, you can’t decide if your application should be process under SDS or Regular, the Visa officer will decide after checking your application & run some background check, this’s also stated on IRCC website, this’s why some people think they applied under SDS but unknown to them their application still fall under regular process, while some think they applied under regular, but the visa officer process it as SDS application.